And I found this site. Seems that he travels to visit Starbucks all over the world (He came to Tokyo and Chiba). I checked the original Starbucks site to see how many stores in Manhattan, but couldn't really get that info at once. His site says that there are over 250 Starbucks in Manhattan now.

余談ですが、アメリカのスタバで豆乳を選ぶと、あらかじめバニラ味で加糖されているのが残念です。加糖なしはありません。

You may know that if you choose soy milk at Starbucks in the U.S., Vanilla syrup is already added, unfortunately... There is no "normal" soy milk served.